ManTech

Description & Requirements

Unlock the secrets of intelligence with ManTech! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we’ve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now—unleash your potential with ManTech!

ManTech seeks a motivated and mission-focused Principal Cyber Systems Engineer to join our team in Chantilly, Virginia.

This role supports complex cybersecurity initiatives by delivering hands-on engineering expertise across a wide range of security technologies. You will help protect vital systems and drive cyber defense innovation in a collaborative, high-impact environment.

Responsibilities include but are not limited to:

• Providing engineering support and system administration for specialized cybersecurity applications and systems—including installation, configuration, maintenance, patching, and backup/restoration
• Serving as a subject matter expert in the creation, editing, and management of signatures, rules, filters, and custom content for cybersecurity systems such as IDS, IPS, firewalls, web application firewalls, proxy servers, and SIEMs
• Applying Systems Engineering best practices specific to Cyber Operations and evaluating enterprise-level cyber requirements against approved architectures and roadmaps; making informed recommendations for requirement approval or rejection
• Administering cybersecurity test beds, conducting tests and evaluations of new tools, access controls, configurations, and signatures/rules
• Providing Tier 2 maintenance support for deployed cybersecurity technologies
• Collaborating with cross-functional engineering teams to design and implement secure systems; working knowledge of the Risk Management Framework (RMF) and NIST 800-53 security controls is essential
• Performing the duties of an Information Systems Security Engineer (ISSE) in coordination with the Program’s ISSE Team

Minimum Qualifications:

• Bachelor’s degree in Information Technology, Information Security, or an additional 4+ years of cybersecurity experience in lieu of a degree
• 7+ years of professional experience in cybersecurity
• Ability to obtain a DoD 8570 certification at IAM-III (CISSP, CISM, GSLC, CCISO) or IAT-III (GCIH, CISSP, CASP+, CCNP Security, CISA, GCED) within 6 months of hire
• Strong technical writing and documentation skills; capable of communicating with diverse stakeholders, from technical teams to senior leadership
• Experience executing the RMF process from system categorization through continuous monitoring
• Familiarity with Systems Security Engineering (SSE) documentation including Cybersecurity Strategies, Information Support Plans, and Program Protection Plans (PPPs)

Preferred Qualifications:

• Experience with ICD 503 and associated Assessment and Accreditation processes and tools
• Familiarity with supplemental security control frameworks such as JSIG and/or ICD 503

Security Clearance Requirements:

• Must have a current/active TS/SCI with Polygraph

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which may involve delivering presentations.

ManTech International Corporation considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with ManTech, please email us at careers@mantech.com and provide your name and contact information.